Techwizz/kernel-fxtec-pro1x
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Dynamic ID addition doesn't need get_driver()

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As part of the removal of get_driver()/put_driver(), this patch
(as1511) changes all the places that add dynamic IDs for drivers.
Since these additions are done by writing to the drivers' sysfs
attribute files, and the attributes are removed when the drivers are
unregistered, there is no reason to take an extra reference to the
drivers.

The one exception is the pci-stub driver, which calls pci_add_dynid()
as part of its registration.  But again, there's no reason to take an
extra reference here, because the driver can't be unloaded while it is
being registered.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Dmitry Torokhov <dmitry.torokhov@gmail.com>
CC: Jiri Kosina <jkosina@suse.cz>
CC: Jesse Barnes <jbarnes@virtuousgeek.org>
CC: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2012-01-24 13:34:41 -05:00 committed by Greg Kroah-Hartman
parent fde25a9b63
commit cef9bc56e1
4 changed files with 3 additions and 15 deletions
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6
drivers/hid/hid-core.c
View file

@ -1619,11 +1619,7 @@ static ssize_t store_new_id(struct device_driver *drv, const char *buf,
list_add_tail(&dynid->list, &hdrv->dyn_list);
spin_unlock(&hdrv->dyn_lock);
ret = 0;
if (get_driver(&hdrv->driver)) {
ret = driver_attach(&hdrv->driver);
put_driver(&hdrv->driver);
}
ret = driver_attach(&hdrv->driver);
return ret ? : count;
}

2
drivers/pci/pci-driver.c
View file

@ -72,9 +72,7 @@ int pci_add_dynid(struct pci_driver *drv,
list_add_tail(&dynid->node, &drv->dynids.list);
spin_unlock(&drv->dynids.lock);
get_driver(&drv->driver);
retval = driver_attach(&drv->driver);
put_driver(&drv->driver);
return retval;
}

5
drivers/pcmcia/ds.c
View file

@ -127,10 +127,7 @@ pcmcia_store_new_id(struct device_driver *driver, const char *buf, size_t count)
list_add_tail(&dynid->node, &pdrv->dynids.list);
mutex_unlock(&pdrv->dynids.lock);
if (get_driver(&pdrv->drv)) {
retval = driver_attach(&pdrv->drv);
put_driver(&pdrv->drv);
}
retval = driver_attach(&pdrv->drv);
if (retval)
return retval;

5
drivers/usb/core/driver.c
View file

@ -71,10 +71,7 @@ ssize_t usb_store_new_id(struct usb_dynids *dynids,
list_add_tail(&dynid->node, &dynids->list);
spin_unlock(&dynids->lock);
if (get_driver(driver)) {
retval = driver_attach(driver);
put_driver(driver);
}
retval = driver_attach(driver);
if (retval)
return retval;